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1. In GMSK 2 questions 1. How much %power we need in bandwidth. 2. What is the raise cosine factor? Why it is important? BT 90% 99% 99.9 0% 99.9 9% 0.2 0.5 2 0.7 9 0.99 1.22 0.2 5 0.5 7 0.8 6 1.09 1.37 0.5 0.6 9 1.0 4 1.33 2.08 MSK 0.7 8 1.2 2.76 6 Filter produces=.25,data rate=270kbps,90% power efficiency needed. T=1/270=3.7µsec. BT=.25,B=.25/3.7=67.657 Khz 3db At BT=.25,90% POWER EFFCICIENCY RF BW occupancy =.57( FROM THE CHART)*270=153Khz The square the wave the more bandwidth it needs in the frequency domain. 2. Why should we use time domain measurement? ( pure time-domain measurements include pulse rise and fall times, overshoot). 3. What is in a BTS? What is in a Radio unit?what is in a upconverter? The parts of a generic GSM BTS are: • Radio unit • Amplifier • Duplexer • Splitter • Combiner The radio unit consists of: • Receiver • Modulator • Up-Converter • Pre-Amplifier An up-converter is composed of a: • Local oscillator • Mixer • Bandpass filter

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Page 1: RF Bsic P5docx

1. In GMSK 2 questions1. How much %power we need in bandwidth.2. What is the raise cosine factor? Why it is important?

BT 90% 99%99.90%

99.99%

0.2 0.52 0.79 0.99 1.220.25 0.57 0.86 1.09 1.370.5 0.69 1.04 1.33 2.08MSK 0.78 1.2 2.76 6

Filter produces=.25,data rate=270kbps,90% power efficiency needed.T=1/270=3.7µsec.BT=.25,B=.25/3.7=67.657 Khz 3dbAt BT=.25,90% POWER EFFCICIENCYRF BW occupancy =.57( FROM THE CHART)*270=153KhzThe square the wave the more bandwidth it needs in the frequency domain.

2. Why should we use time domain measurement? ( pure time-domain measurementsinclude pulse rise and fall times, overshoot).

3. What is in a BTS? What is in a Radio unit?what is in a upconverter?The parts of a generic GSM BTS are: • Radio unit • Amplifier • Duplexer • Splitter • Combiner

The radio unit consists of: • Receiver • Modulator • Up-Converter • Pre-Amplifier

An up-converter is composed of a: • Local oscillator • Mixer • Bandpass filter

Duplexer or channel filter

Mixer

Class A amplifier

http://www.google.com.bd/imgres?q=nonlinear+mixer&um=1&sa=N&hl=en&biw=1280&bih=576&tbm=isch&tbnid=fF5e_t9ohlV6nM:&imgrefurl=http://en.wikipedia.org/wiki/Electronic_mixer&docid=-NovkLKUL0RLmM&imgurl=http://upload.wikimedia.org/wikipedia/en/thumb/5/5a/Passive_Mixer.jpg/250px-Passive_Mixer.jpg&w=250&h=234&ei=Ynt7UavRE4ePrgeYjYCYCw&zoom=1&iact=hc&vpx=2&vpy=257&dur=22031&hovh=187&hovw=200&tx=71&ty=69&page=3&tbnh=135&tbnw=158&start=41&ndsp=22&ved=1t:429,r:41,s:0,i:209
Page 2: RF Bsic P5docx

4. How many filters are in duplexer?what kind faults occur in common band pass filter used in duplexer?a. Distortion of Signals b. Excessive Amplitudec. Passband Tilt d. Ripple in Passband

5. What is linear and non linear amplifier ?Linear amplifier : uses normal circuit and small scale amplifierNon-linear amplifier : diode and amplifier . 6. What is a mixer and why we use it?How many types of mixer are there(pssive,Active)?What type of mixing we

use in Radio communication?(amplifier,linear summing of signals) Why a filter is used just after a mixer?


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